Impact-resistant core-shell emulsion polymer containing pores in the particles and method for preparing the same

摘要

The present invention relates to a method for preparing an impact-resistant core-shell emulsion polymer containing pores in a particle, wherein the acid monomer, ethylene is added to a seed particle prepared by polymerizing an ethylenically unsaturated monomer, an emulsifier and a radical initiator, and optionally an acid equivalent. Adding an unsaturated monomer and a crosslinking agent to prepare alkali swellable particles by an emulsion polymerization method; Preparing an elastomeric rubbery polymer by reacting the swellable particles with 0.1-20% by weight of an acid monomer, 99.85-75% by weight of a relatively low Tg, and 0.05-5% by weight of a crosslinking agent; Neutralizing the elastomeric rubbery polymer to a pH in the range of 7 to 12; And adding to the neutralized elastomeric rubber polymer a mixture of a hard skin polymer made of an acrylic monomer having a relatively high Tg and a rubber phase forming monomer, and a mixture made of a hard skin forming monomer including a crosslinking agent and a chain regulator. A step of preparing an interlayer copolymer by emulsion polymerization, wherein the final emulsion polymer has a particle size of 0.15 to 0.4 micron, a single pore diameter of 0.05 to 0.2 micron, and an acid monomer contained in the alkaline swellable particles. It is 15 to 40% by weight, the glass transition temperature of the elastomeric rubber-like polymer is -20 ℃ or less, the glass transition temperature of the interlayer copolymer is 0 to 40 ℃ relates to a core-shell emulsion polymer and a method for producing the same.